Re: [ServiceWorker] Merge service worker client into "environment settings object" (#516)

A [document environment](https://html.spec.whatwg.org/#document-environment) is already a JavaScript global environment. So we can get to an environment settings object from there, but cannot get one without a JS global environment. But a service worker can control a document which has no script at all. We need the client concept can represent that bit as well.

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